Abstract: Lithium hexafluorophosphate has outstanding oxidation stability and high ion conductivity，so it is the preferred electrolyte material in lithium-ion batteries，and many scholars at home and abroad pay attention to it.Methods，such as gas-solid reaction method，organic solvent method，ion-exchange method，and anhydrous hydrogen fluoride method，of preparing lithium hexafluorophosphate were summarized，and their advantages and disadvantages were also discussed.Influences of the impurities in lithium hexafluorophosphate on product performance were analyzed.Meanwhile，the basic principle，process flow，product standard，and main impurities test method of hydrogen fluoride industrially produced with anhydrous hydrogen fluoride method were emphatically introduced.

Key words: lithium-ion batteries, lithium hexafluorophosphate, product analysis